0 - ring: 0 - coord: [0,0]
  1 - ring: 1 - coord: [1,1]
  2 - ring: 1 - coord: [1,0]
  3 - ring: 1 - coord: [1,-1]
  4 - ring: 1 - coord: [0,-1]
  5 - ring: 1 - coord: [-1,-1]
  6 - ring: 1 - coord: [-1,0]
  7 - ring: 1 - coord: [-1,1]
  8 - ring: 1 - coord: [0,1]
  9 - ring: 2 - coord: [2,2]
 10 - ring: 2 - coord: [2,1]
 11 - ring: 2 - coord: [2,0]
 12 - ring: 2 - coord: [2,-1]
 13 - ring: 2 - coord: [2,-2]
 14 - ring: 2 - coord: [1,-2]
 15 - ring: 2 - coord: [0,-2]
 16 - ring: 2 - coord: [-1,-2]
 17 - ring: 2 - coord: [-2,-2]
 18 - ring: 2 - coord: [-2,-1]
 19 - ring: 2 - coord: [-2,0]
 20 - ring: 2 - coord: [-2,1]
 21 - ring: 2 - coord: [-2,2]
 22 - ring: 2 - coord: [-1,2]
 23 - ring: 2 - coord: [0,2]
 24 - ring: 2 - coord: [1,2]
 25 - ring: 3 - coord: [3,3]
 26 - ring: 3 - coord: [3,2]
 27 - ring: 3 - coord: [3,1]
 28 - ring: 3 - coord: [3,0]
 29 - ring: 3 - coord: [3,-1]
 30 - ring: 3 - coord: [3,-2]
 31 - ring: 3 - coord: [3,-3]
 32 - ring: 3 - coord: [2,-3]
 33 - ring: 3 - coord: [1,-3]
 34 - ring: 3 - coord: [0,-3]
 35 - ring: 3 - coord: [-1,-3]
 36 - ring: 3 - coord: [-2,-3]
 37 - ring: 3 - coord: [-3,-3]
 38 - ring: 3 - coord: [-3,-2]
 39 - ring: 3 - coord: [-3,-1]
 40 - ring: 3 - coord: [-3,0]
 41 - ring: 3 - coord: [-3,1]
 42 - ring: 3 - coord: [-3,2]
 43 - ring: 3 - coord: [-3,3]
 44 - ring: 3 - coord: [-2,3]
 45 - ring: 3 - coord: [-1,3]
 46 - ring: 3 - coord: [0,3]
 47 - ring: 3 - coord: [1,3]
 48 - ring: 3 - coord: [2,3]
 49 - ring: 4 - coord: [4,4]
 50 - ring: 4 - coord: [4,3]